Return source as String + Cleanup

[nicoruti]

Adds method JestResult#getSourceString() (incl. tests in JestResultTest)

In addition:

• cleaned up some unused imports and variables
• make use of org.junit instead of junit.assert.
• JestHttpClient needs not to implement JestClient, as it already extends AbstractJestClient which implements it.

[kramer]

Hi @nicoruti ,

Sorry for the late reply. I think naming the method getSourceAsString would be more in line with the existing methods getSourceAsObject and getSourceAsObjectList. Also going through the regular parser methods when converting to string seems unnecessary (especially for that ES_METADATA_ID field) so why not do something like this:

    public String getSourceAsString() {
        String[] keys = getKeys();
        if(!isSucceeded || jsonObject == null || keys == null || keys.length == 0 || !jsonObject.has(keys[0])) {
            return null;
        }

        JsonElement obj = jsonObject.get(keys[0]);
        for (int i = 1; i < keys.length; i++) {
            obj = ((JsonObject) obj).get(keys[i]);
        }
        return obj.toString();
    }

[nicoruti]

Hi @kramer

Thanks for your remarks. Yes, the method getSourceAsString fits the naming convention. I changed it as you proposed. I also used your code snippet, as it's more performant than the 'original'.

[kramer]

Thank you for the contribution @nicoruti !